Fujitsu AB12 Service Manual page 103

ERROR
ERROR
CODE
21 1. Generation condition.
Discharge
temperature 1
error
2. Corresponding operation.
3. Reset condition.
1) Discharge temperature
2) Discharge temperature
CONTENTS
Discharge temperature 1
remains 130 C or greater for
40 minutes and compressor
1 stopped 2 times or more.
Error display to outdoor unit
LED and error output to
communication bus line.
When all the following
conditions are satisfied:
protector 1 reset.
protector not operated for 40
minutes or longer.
ERROR CAUSE
1. Gas leak or refrigerant level
low.
2. Outdoor fan motor faulty.
3. Discharge temperature
sensor TH faulty.
D1
4. Electronic expansion valve
operation faulty.
5. Solenoid valve operation
faulty.
– 103 –
REMEDY
1. Check for leak and check additional
refrigerant amount and recharge
suitable refrigerant.
2. Check outdoor fan motor operation.
Remove wind path obstruction. If fan
motor faulty, replace motor.
3. Check for loose or dislodged discharge
temperature sensor TH
D1
check TH resistance. If abnormal,
D1
replace sensor.
4. Check operation and coil resistance of
following electronic expansion valve. If
abnormal, replace electronic
expansion valve.
Coil resistance measurement points.
Red-white, red-orange, brown-yellow,
brown-blue.
(1) Outdoor unit electronic expansion
valve EEV1 and EEV2 Coil resistance:
192 +/-19 ohms.
(2) Indoor units electronic expansion valve
EEV Coil resistance: 150 +/-50 ohms.
5. Check operation of following solenoid
valves. If operation faulty, replace
solenoid valve.
Cooling operation.
(1) Outdoor unit solenoid valve SV1.
(2) RB unit solenoid valves SV
Heating operation.
(3) Outdoor units solenoid valves SV1,
SV7, and SV8.
(4) RB unit solenoid valve SV
Heat recovery operation (1), (2), (3), (4).
wiring and
S
.
D